STOCK-BASED COMPENSATION - Fair Value of Employee Stock Options Granted as Determined by Black-Scholes Valuation Model Assumptions (Detail) - $ / shares |
3 Months Ended | 9 Months Ended | |
|---|---|---|---|
Jun. 30, 2018 |
Sep. 30, 2018 |
Sep. 30, 2017 |
|
| Nonqualified Stock Options [Member] | |||
| Stockholders Equity Note [Line Items] | |||
| Risk-free interest rate | 2.84% | 2.15% | |
| Expected volatility | 16.72% | 17.81% | |
| Weighted-average fair value of options granted (usd per share) | $ 15.23 | $ 14.70 | |
| Expected dividend yield | 2.93% | 2.89% | |
| Expected life (in years) | 7 years 6 months | 7 years 6 months | |
| Long-Term Incentive Performance Award | |||
| Stockholders Equity Note [Line Items] | |||
| Risk-free interest rate | 2.61% | 2.70% | 1.46% |
| Expected volatility | 16.51% | 16.91% | 16.59% |
| Weighted-average fair value of options granted (usd per share) | $ 137.53 | $ 156.55 | $ 119.29 |
| Expected dividend yield | 123.46% | 129.83% | 113.55% |
| X | ||||||||||
- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|